Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: sched: arch_reinit_sched_domains() must destroy domains to force rebuild sched, cpuset: rework sched domains and CPU hotplug handling (v4)
This commit is contained in:
Linus Torvalds
Коммит
e1d7bf1499
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@ -160,7 +160,7 @@ static inline int current_cpuset_is_being_rebound(void)
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static inline void rebuild_sched_domains(void)
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{
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partition_sched_domains(0, NULL, NULL);
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partition_sched_domains(1, NULL, NULL);
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}
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#endif /* !CONFIG_CPUSETS */
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318
kernel/cpuset.c
318
kernel/cpuset.c
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@ -14,6 +14,8 @@
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* 2003-10-22 Updates by Stephen Hemminger.
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* 2004 May-July Rework by Paul Jackson.
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* 2006 Rework by Paul Menage to use generic cgroups
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* 2008 Rework of the scheduler domains and CPU hotplug handling
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* by Max Krasnyansky
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of the Linux
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@ -236,9 +238,11 @@ static struct cpuset top_cpuset = {
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static DEFINE_MUTEX(callback_mutex);
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/* This is ugly, but preserves the userspace API for existing cpuset
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/*
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* This is ugly, but preserves the userspace API for existing cpuset
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* users. If someone tries to mount the "cpuset" filesystem, we
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* silently switch it to mount "cgroup" instead */
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* silently switch it to mount "cgroup" instead
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*/
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static int cpuset_get_sb(struct file_system_type *fs_type,
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int flags, const char *unused_dev_name,
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void *data, struct vfsmount *mnt)
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@ -473,10 +477,9 @@ static int validate_change(const struct cpuset *cur, const struct cpuset *trial)
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}
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/*
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* Helper routine for rebuild_sched_domains().
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* Helper routine for generate_sched_domains().
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* Do cpusets a, b have overlapping cpus_allowed masks?
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*/
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static int cpusets_overlap(struct cpuset *a, struct cpuset *b)
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{
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return cpus_intersects(a->cpus_allowed, b->cpus_allowed);
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@ -518,26 +521,15 @@ update_domain_attr_tree(struct sched_domain_attr *dattr, struct cpuset *c)
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}
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/*
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* rebuild_sched_domains()
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* generate_sched_domains()
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*
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* This routine will be called to rebuild the scheduler's dynamic
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* sched domains:
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* - if the flag 'sched_load_balance' of any cpuset with non-empty
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* 'cpus' changes,
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* - or if the 'cpus' allowed changes in any cpuset which has that
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* flag enabled,
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* - or if the 'sched_relax_domain_level' of any cpuset which has
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* that flag enabled and with non-empty 'cpus' changes,
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* - or if any cpuset with non-empty 'cpus' is removed,
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* - or if a cpu gets offlined.
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*
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* This routine builds a partial partition of the systems CPUs
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* (the set of non-overlappping cpumask_t's in the array 'part'
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* below), and passes that partial partition to the kernel/sched.c
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* partition_sched_domains() routine, which will rebuild the
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* schedulers load balancing domains (sched domains) as specified
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* by that partial partition. A 'partial partition' is a set of
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* non-overlapping subsets whose union is a subset of that set.
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* This function builds a partial partition of the systems CPUs
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* A 'partial partition' is a set of non-overlapping subsets whose
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* union is a subset of that set.
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* The output of this function needs to be passed to kernel/sched.c
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* partition_sched_domains() routine, which will rebuild the scheduler's
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* load balancing domains (sched domains) as specified by that partial
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* partition.
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*
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* See "What is sched_load_balance" in Documentation/cpusets.txt
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* for a background explanation of this.
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@ -547,13 +539,7 @@ update_domain_attr_tree(struct sched_domain_attr *dattr, struct cpuset *c)
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* domains when operating in the severe memory shortage situations
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* that could cause allocation failures below.
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*
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* Call with cgroup_mutex held. May take callback_mutex during
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* call due to the kfifo_alloc() and kmalloc() calls. May nest
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* a call to the get_online_cpus()/put_online_cpus() pair.
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* Must not be called holding callback_mutex, because we must not
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* call get_online_cpus() while holding callback_mutex. Elsewhere
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* the kernel nests callback_mutex inside get_online_cpus() calls.
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* So the reverse nesting would risk an ABBA deadlock.
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* Must be called with cgroup_lock held.
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*
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* The three key local variables below are:
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* q - a linked-list queue of cpuset pointers, used to implement a
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@ -588,10 +574,10 @@ update_domain_attr_tree(struct sched_domain_attr *dattr, struct cpuset *c)
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* element of the partition (one sched domain) to be passed to
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* partition_sched_domains().
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*/
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void rebuild_sched_domains(void)
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static int generate_sched_domains(cpumask_t **domains,
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struct sched_domain_attr **attributes)
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{
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LIST_HEAD(q); /* queue of cpusets to be scanned*/
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LIST_HEAD(q); /* queue of cpusets to be scanned */
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struct cpuset *cp; /* scans q */
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struct cpuset **csa; /* array of all cpuset ptrs */
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int csn; /* how many cpuset ptrs in csa so far */
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@ -601,23 +587,26 @@ void rebuild_sched_domains(void)
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int ndoms; /* number of sched domains in result */
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int nslot; /* next empty doms[] cpumask_t slot */
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csa = NULL;
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ndoms = 0;
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doms = NULL;
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dattr = NULL;
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csa = NULL;
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/* Special case for the 99% of systems with one, full, sched domain */
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if (is_sched_load_balance(&top_cpuset)) {
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ndoms = 1;
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doms = kmalloc(sizeof(cpumask_t), GFP_KERNEL);
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if (!doms)
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goto rebuild;
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goto done;
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dattr = kmalloc(sizeof(struct sched_domain_attr), GFP_KERNEL);
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if (dattr) {
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*dattr = SD_ATTR_INIT;
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update_domain_attr_tree(dattr, &top_cpuset);
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}
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*doms = top_cpuset.cpus_allowed;
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goto rebuild;
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ndoms = 1;
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goto done;
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}
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csa = kmalloc(number_of_cpusets * sizeof(cp), GFP_KERNEL);
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@ -680,61 +669,141 @@ restart:
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}
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}
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/* Convert <csn, csa> to <ndoms, doms> */
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/*
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* Now we know how many domains to create.
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* Convert <csn, csa> to <ndoms, doms> and populate cpu masks.
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*/
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doms = kmalloc(ndoms * sizeof(cpumask_t), GFP_KERNEL);
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if (!doms)
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goto rebuild;
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if (!doms) {
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ndoms = 0;
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goto done;
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}
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/*
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* The rest of the code, including the scheduler, can deal with
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* dattr==NULL case. No need to abort if alloc fails.
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*/
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dattr = kmalloc(ndoms * sizeof(struct sched_domain_attr), GFP_KERNEL);
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for (nslot = 0, i = 0; i < csn; i++) {
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struct cpuset *a = csa[i];
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cpumask_t *dp;
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int apn = a->pn;
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if (apn >= 0) {
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cpumask_t *dp = doms + nslot;
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if (nslot == ndoms) {
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static int warnings = 10;
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if (warnings) {
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printk(KERN_WARNING
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"rebuild_sched_domains confused:"
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" nslot %d, ndoms %d, csn %d, i %d,"
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" apn %d\n",
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nslot, ndoms, csn, i, apn);
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warnings--;
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}
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continue;
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}
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cpus_clear(*dp);
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if (dattr)
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*(dattr + nslot) = SD_ATTR_INIT;
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for (j = i; j < csn; j++) {
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struct cpuset *b = csa[j];
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if (apn == b->pn) {
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cpus_or(*dp, *dp, b->cpus_allowed);
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b->pn = -1;
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if (dattr)
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update_domain_attr_tree(dattr
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+ nslot, b);
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}
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}
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nslot++;
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if (apn < 0) {
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/* Skip completed partitions */
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continue;
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}
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dp = doms + nslot;
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if (nslot == ndoms) {
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static int warnings = 10;
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if (warnings) {
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printk(KERN_WARNING
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"rebuild_sched_domains confused:"
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" nslot %d, ndoms %d, csn %d, i %d,"
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" apn %d\n",
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nslot, ndoms, csn, i, apn);
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warnings--;
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}
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continue;
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}
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cpus_clear(*dp);
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if (dattr)
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*(dattr + nslot) = SD_ATTR_INIT;
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for (j = i; j < csn; j++) {
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struct cpuset *b = csa[j];
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if (apn == b->pn) {
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cpus_or(*dp, *dp, b->cpus_allowed);
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if (dattr)
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update_domain_attr_tree(dattr + nslot, b);
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/* Done with this partition */
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b->pn = -1;
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}
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}
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nslot++;
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}
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BUG_ON(nslot != ndoms);
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rebuild:
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/* Have scheduler rebuild sched domains */
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get_online_cpus();
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partition_sched_domains(ndoms, doms, dattr);
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put_online_cpus();
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done:
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kfree(csa);
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/* Don't kfree(doms) -- partition_sched_domains() does that. */
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/* Don't kfree(dattr) -- partition_sched_domains() does that. */
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*domains = doms;
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*attributes = dattr;
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return ndoms;
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}
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/*
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* Rebuild scheduler domains.
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*
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* Call with neither cgroup_mutex held nor within get_online_cpus().
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* Takes both cgroup_mutex and get_online_cpus().
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*
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* Cannot be directly called from cpuset code handling changes
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* to the cpuset pseudo-filesystem, because it cannot be called
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* from code that already holds cgroup_mutex.
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*/
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static void do_rebuild_sched_domains(struct work_struct *unused)
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{
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struct sched_domain_attr *attr;
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cpumask_t *doms;
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int ndoms;
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get_online_cpus();
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/* Generate domain masks and attrs */
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cgroup_lock();
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ndoms = generate_sched_domains(&doms, &attr);
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cgroup_unlock();
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/* Have scheduler rebuild the domains */
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partition_sched_domains(ndoms, doms, attr);
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put_online_cpus();
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}
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static DECLARE_WORK(rebuild_sched_domains_work, do_rebuild_sched_domains);
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/*
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* Rebuild scheduler domains, asynchronously via workqueue.
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*
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* If the flag 'sched_load_balance' of any cpuset with non-empty
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* 'cpus' changes, or if the 'cpus' allowed changes in any cpuset
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* which has that flag enabled, or if any cpuset with a non-empty
|
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* 'cpus' is removed, then call this routine to rebuild the
|
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* scheduler's dynamic sched domains.
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*
|
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* The rebuild_sched_domains() and partition_sched_domains()
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* routines must nest cgroup_lock() inside get_online_cpus(),
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* but such cpuset changes as these must nest that locking the
|
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* other way, holding cgroup_lock() for much of the code.
|
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*
|
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* So in order to avoid an ABBA deadlock, the cpuset code handling
|
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* these user changes delegates the actual sched domain rebuilding
|
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* to a separate workqueue thread, which ends up processing the
|
||||
* above do_rebuild_sched_domains() function.
|
||||
*/
|
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static void async_rebuild_sched_domains(void)
|
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{
|
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schedule_work(&rebuild_sched_domains_work);
|
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}
|
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|
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/*
|
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* Accomplishes the same scheduler domain rebuild as the above
|
||||
* async_rebuild_sched_domains(), however it directly calls the
|
||||
* rebuild routine synchronously rather than calling it via an
|
||||
* asynchronous work thread.
|
||||
*
|
||||
* This can only be called from code that is not holding
|
||||
* cgroup_mutex (not nested in a cgroup_lock() call.)
|
||||
*/
|
||||
void rebuild_sched_domains(void)
|
||||
{
|
||||
do_rebuild_sched_domains(NULL);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -863,7 +932,7 @@ static int update_cpumask(struct cpuset *cs, const char *buf)
|
|||
return retval;
|
||||
|
||||
if (is_load_balanced)
|
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rebuild_sched_domains();
|
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async_rebuild_sched_domains();
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -1090,7 +1159,7 @@ static int update_relax_domain_level(struct cpuset *cs, s64 val)
|
|||
if (val != cs->relax_domain_level) {
|
||||
cs->relax_domain_level = val;
|
||||
if (!cpus_empty(cs->cpus_allowed) && is_sched_load_balance(cs))
|
||||
rebuild_sched_domains();
|
||||
async_rebuild_sched_domains();
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
|
@ -1131,7 +1200,7 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
|
|||
mutex_unlock(&callback_mutex);
|
||||
|
||||
if (cpus_nonempty && balance_flag_changed)
|
||||
rebuild_sched_domains();
|
||||
async_rebuild_sched_domains();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1492,6 +1561,9 @@ static u64 cpuset_read_u64(struct cgroup *cont, struct cftype *cft)
|
|||
default:
|
||||
BUG();
|
||||
}
|
||||
|
||||
/* Unreachable but makes gcc happy */
|
||||
return 0;
|
||||
}
|
||||
|
||||
static s64 cpuset_read_s64(struct cgroup *cont, struct cftype *cft)
|
||||
|
|
@ -1504,6 +1576,9 @@ static s64 cpuset_read_s64(struct cgroup *cont, struct cftype *cft)
|
|||
default:
|
||||
BUG();
|
||||
}
|
||||
|
||||
/* Unrechable but makes gcc happy */
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -1692,15 +1767,9 @@ static struct cgroup_subsys_state *cpuset_create(
|
|||
}
|
||||
|
||||
/*
|
||||
* Locking note on the strange update_flag() call below:
|
||||
*
|
||||
* If the cpuset being removed has its flag 'sched_load_balance'
|
||||
* enabled, then simulate turning sched_load_balance off, which
|
||||
* will call rebuild_sched_domains(). The get_online_cpus()
|
||||
* call in rebuild_sched_domains() must not be made while holding
|
||||
* callback_mutex. Elsewhere the kernel nests callback_mutex inside
|
||||
* get_online_cpus() calls. So the reverse nesting would risk an
|
||||
* ABBA deadlock.
|
||||
* will call async_rebuild_sched_domains().
|
||||
*/
|
||||
|
||||
static void cpuset_destroy(struct cgroup_subsys *ss, struct cgroup *cont)
|
||||
|
|
@ -1719,7 +1788,7 @@ static void cpuset_destroy(struct cgroup_subsys *ss, struct cgroup *cont)
|
|||
struct cgroup_subsys cpuset_subsys = {
|
||||
.name = "cpuset",
|
||||
.create = cpuset_create,
|
||||
.destroy = cpuset_destroy,
|
||||
.destroy = cpuset_destroy,
|
||||
.can_attach = cpuset_can_attach,
|
||||
.attach = cpuset_attach,
|
||||
.populate = cpuset_populate,
|
||||
|
|
@ -1811,7 +1880,7 @@ static void move_member_tasks_to_cpuset(struct cpuset *from, struct cpuset *to)
|
|||
}
|
||||
|
||||
/*
|
||||
* If common_cpu_mem_hotplug_unplug(), below, unplugs any CPUs
|
||||
* If CPU and/or memory hotplug handlers, below, unplug any CPUs
|
||||
* or memory nodes, we need to walk over the cpuset hierarchy,
|
||||
* removing that CPU or node from all cpusets. If this removes the
|
||||
* last CPU or node from a cpuset, then move the tasks in the empty
|
||||
|
|
@ -1902,35 +1971,6 @@ static void scan_for_empty_cpusets(const struct cpuset *root)
|
|||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* The cpus_allowed and mems_allowed nodemasks in the top_cpuset track
|
||||
* cpu_online_map and node_states[N_HIGH_MEMORY]. Force the top cpuset to
|
||||
* track what's online after any CPU or memory node hotplug or unplug event.
|
||||
*
|
||||
* Since there are two callers of this routine, one for CPU hotplug
|
||||
* events and one for memory node hotplug events, we could have coded
|
||||
* two separate routines here. We code it as a single common routine
|
||||
* in order to minimize text size.
|
||||
*/
|
||||
|
||||
static void common_cpu_mem_hotplug_unplug(int rebuild_sd)
|
||||
{
|
||||
cgroup_lock();
|
||||
|
||||
top_cpuset.cpus_allowed = cpu_online_map;
|
||||
top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
|
||||
scan_for_empty_cpusets(&top_cpuset);
|
||||
|
||||
/*
|
||||
* Scheduler destroys domains on hotplug events.
|
||||
* Rebuild them based on the current settings.
|
||||
*/
|
||||
if (rebuild_sd)
|
||||
rebuild_sched_domains();
|
||||
|
||||
cgroup_unlock();
|
||||
}
|
||||
|
||||
/*
|
||||
* The top_cpuset tracks what CPUs and Memory Nodes are online,
|
||||
* period. This is necessary in order to make cpusets transparent
|
||||
|
|
@ -1939,40 +1979,52 @@ static void common_cpu_mem_hotplug_unplug(int rebuild_sd)
|
|||
*
|
||||
* This routine ensures that top_cpuset.cpus_allowed tracks
|
||||
* cpu_online_map on each CPU hotplug (cpuhp) event.
|
||||
*
|
||||
* Called within get_online_cpus(). Needs to call cgroup_lock()
|
||||
* before calling generate_sched_domains().
|
||||
*/
|
||||
|
||||
static int cpuset_handle_cpuhp(struct notifier_block *unused_nb,
|
||||
static int cpuset_track_online_cpus(struct notifier_block *unused_nb,
|
||||
unsigned long phase, void *unused_cpu)
|
||||
{
|
||||
struct sched_domain_attr *attr;
|
||||
cpumask_t *doms;
|
||||
int ndoms;
|
||||
|
||||
switch (phase) {
|
||||
case CPU_UP_CANCELED:
|
||||
case CPU_UP_CANCELED_FROZEN:
|
||||
case CPU_DOWN_FAILED:
|
||||
case CPU_DOWN_FAILED_FROZEN:
|
||||
case CPU_ONLINE:
|
||||
case CPU_ONLINE_FROZEN:
|
||||
case CPU_DEAD:
|
||||
case CPU_DEAD_FROZEN:
|
||||
common_cpu_mem_hotplug_unplug(1);
|
||||
break;
|
||||
|
||||
default:
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
cgroup_lock();
|
||||
top_cpuset.cpus_allowed = cpu_online_map;
|
||||
scan_for_empty_cpusets(&top_cpuset);
|
||||
ndoms = generate_sched_domains(&doms, &attr);
|
||||
cgroup_unlock();
|
||||
|
||||
/* Have scheduler rebuild the domains */
|
||||
partition_sched_domains(ndoms, doms, attr);
|
||||
|
||||
return NOTIFY_OK;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_MEMORY_HOTPLUG
|
||||
/*
|
||||
* Keep top_cpuset.mems_allowed tracking node_states[N_HIGH_MEMORY].
|
||||
* Call this routine anytime after you change
|
||||
* node_states[N_HIGH_MEMORY].
|
||||
* See also the previous routine cpuset_handle_cpuhp().
|
||||
* Call this routine anytime after node_states[N_HIGH_MEMORY] changes.
|
||||
* See also the previous routine cpuset_track_online_cpus().
|
||||
*/
|
||||
|
||||
void cpuset_track_online_nodes(void)
|
||||
{
|
||||
common_cpu_mem_hotplug_unplug(0);
|
||||
cgroup_lock();
|
||||
top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
|
||||
scan_for_empty_cpusets(&top_cpuset);
|
||||
cgroup_unlock();
|
||||
}
|
||||
#endif
|
||||
|
||||
|
|
@ -1987,7 +2039,7 @@ void __init cpuset_init_smp(void)
|
|||
top_cpuset.cpus_allowed = cpu_online_map;
|
||||
top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
|
||||
|
||||
hotcpu_notifier(cpuset_handle_cpuhp, 0);
|
||||
hotcpu_notifier(cpuset_track_online_cpus, 0);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
|
|||
|
|
@ -7696,24 +7696,27 @@ static int dattrs_equal(struct sched_domain_attr *cur, int idx_cur,
|
|||
* and partition_sched_domains() will fallback to the single partition
|
||||
* 'fallback_doms', it also forces the domains to be rebuilt.
|
||||
*
|
||||
* If doms_new==NULL it will be replaced with cpu_online_map.
|
||||
* ndoms_new==0 is a special case for destroying existing domains.
|
||||
* It will not create the default domain.
|
||||
*
|
||||
* Call with hotplug lock held
|
||||
*/
|
||||
void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
|
||||
struct sched_domain_attr *dattr_new)
|
||||
{
|
||||
int i, j;
|
||||
int i, j, n;
|
||||
|
||||
mutex_lock(&sched_domains_mutex);
|
||||
|
||||
/* always unregister in case we don't destroy any domains */
|
||||
unregister_sched_domain_sysctl();
|
||||
|
||||
if (doms_new == NULL)
|
||||
ndoms_new = 0;
|
||||
n = doms_new ? ndoms_new : 0;
|
||||
|
||||
/* Destroy deleted domains */
|
||||
for (i = 0; i < ndoms_cur; i++) {
|
||||
for (j = 0; j < ndoms_new; j++) {
|
||||
for (j = 0; j < n; j++) {
|
||||
if (cpus_equal(doms_cur[i], doms_new[j])
|
||||
&& dattrs_equal(dattr_cur, i, dattr_new, j))
|
||||
goto match1;
|
||||
|
|
@ -7726,7 +7729,6 @@ match1:
|
|||
|
||||
if (doms_new == NULL) {
|
||||
ndoms_cur = 0;
|
||||
ndoms_new = 1;
|
||||
doms_new = &fallback_doms;
|
||||
cpus_andnot(doms_new[0], cpu_online_map, cpu_isolated_map);
|
||||
dattr_new = NULL;
|
||||
|
|
@ -7763,8 +7765,13 @@ match2:
|
|||
int arch_reinit_sched_domains(void)
|
||||
{
|
||||
get_online_cpus();
|
||||
|
||||
/* Destroy domains first to force the rebuild */
|
||||
partition_sched_domains(0, NULL, NULL);
|
||||
|
||||
rebuild_sched_domains();
|
||||
put_online_cpus();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -7848,7 +7855,7 @@ static int update_sched_domains(struct notifier_block *nfb,
|
|||
case CPU_ONLINE_FROZEN:
|
||||
case CPU_DEAD:
|
||||
case CPU_DEAD_FROZEN:
|
||||
partition_sched_domains(0, NULL, NULL);
|
||||
partition_sched_domains(1, NULL, NULL);
|
||||
return NOTIFY_OK;
|
||||
|
||||
default:
|
||||
|
|
|
|||
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